IGCSE Biology - Blood Vessels

Which of the following is true of an artery?

One, some or all answers could be correct?

• it carries blood back to the heart

• it has a thick layer of elastic tissue

• it has a thin layer of muscle tissue

• it has a narrow lumen

Which of the following is true of an artery?

One, some or all answers could be correct?

• it carries blood at a high pressure

• it always carries oxygenated blood

• it carries blood away from the heart

• it has an outer layer of connective tissue

Which of the following is true of a vein?

One, some or all answers could be correct?

• it carries blood back to the heart

• it has a thick layer of elastic tissue

• it has a thin layer of muscle tissue

• it has a wide lumen

Which of the following is true of a vein?

One, some or all answers could be correct?

• it carries blood at a high pressure

• it always carries deoxygenated blood

• it carries blood away from the heart

• it contains valves

Arteries have a thick layer of muscle and elastic tissue.

Why is this important?

One, some or all answers could be correct?

• Prevents arteries from bursting due to high blood pressure

• Smooths out blood flow so it is in pulses

• Helps to force blood back to the heart

• Helps the artery to pick up oxygen

Veins have valves that prevent blood from falling backwards.

Why would this happen if there were no valves?

One, some or all answers could be correct?

• Blood is much heavier in veins

• Blood in veins is at a lower pressure

• Gravity is in the opposite direction to the flow of blood

• Blood is much thicker in veins

Which of the following is/are true of a venule?

One, some or all answers could be correct?

• It is a small vein

• It connects arteries to capillaries

• It ensures that blood containing wastes is taken away from organs by veins

• It usually carries oxygenated blood

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Which of the following is/are true of an arteriole?

One, some or all answers could be correct?

• It is a small artery

• It connects arteries to capillaries

• It contains smooth muscle that can contract and relax

• It controls blood flow to different organs by changing its diameter

Which of the following is/are true of a capillary?

One, some or all answers could be correct?

• It connects an artery and a vein

• It exchanges substances between the blood and organs

• It contains valves

• It has very thin walls for fast diffusion of substances across it

Which of the following shows a correct route for the exchange of substances in blood?

• arteriole --> artery --> capillary --> vein --> venule

• artery --> vein --> capillary --> venule --> arteriole

• venule --> vein --> capillary --> artery --> arteriole

• artery --> arteriole --> capillary --> venule --> vein